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| 389915807 | Accommodation | Changing existing mental structures to explain new experiences. | 0 | |
| 389915808 | Age of viability | The age at which a baby can survive in the event of a premature birth. | 1 | |
| 389915809 | Animism | The belief that all things are living. | 2 | |
| 389915810 | Assimilation | Interpreting new experiences in terms of existing mental structures without changing them. | 3 | |
| 389915811 | Attachment | A close, emotional bond of affection between infants and their caregivers. | 4 | |
| 389915812 | Centration | The tendency to focus on just one feature of a problem, neglecting other important aspects. | 5 | |
| 389915813 | Cephalocaudal trend | The head-to-foot direction of motor development. | 6 | |
| 389915814 | Cognitive-behavioral treatments | A varied combination of verbal interventions and behaviora modification techniques used to help clients change maladaptive patterns of thinking. | 7 | |
| 389915815 | Conservation | Piaget's term for the awareness that physical quantities remain constant in spite of changes in their shape or appearance. | 8 | |
| 389915816 | Cross-sectional design | A research design in which investigators compare groups of subjects of differing age who are observed at a single point in time. | 9 | |
| 389915817 | Dementia | An abnormal condition marked by multiple cognitive defects that include memory impairment. | 10 | |
| 389915818 | Development | The sequence of age-related changes that occur as a person progresses from conception to death. | 11 | |
| 389915819 | Developmental norms | The average age at which individuals display various behaviors and abilities. | 12 | |
| 389915820 | Dishabituation | An increase in the strength of a habituated response elicited by a new stimulus. | 13 | |
| 389915821 | Egocentrism | A limited ability to share another person's viewpoint. | 14 | |
| 389915822 | Embryonic stage | The second stage of prenatal development, lasting from two weeks until the end of the second month. | 15 | |
| 389915823 | Family life cycle | A sequence of stages that families tend to progress through. | 16 | |
| 389915824 | Fetal alcohol syndrome | A collection of congenital (inborn) problems associated with excessive alcohol use during pregnancy. | 17 | |
| 389915825 | Fetal stage | The third stage of prenatal development, lasting from two months through birth. | 18 | |
| 389915826 | Gender | Culturally constructed distinctions between masculinity and femininity. | 19 | |
| 389915827 | Gender differences | Actual disparities between the sexes in typical behavior or average ability. | 20 | |
| 389915828 | Gender roles | Expectations about what is appropriate behavior for each sex. | 21 | |
| 389915830 | Gender stereotypes | Widely held beliefs about males' and females' abilities, personality traits, and behavior. | 22 | |
| 389915832 | Germinal stage | The first phase of prenatal development, encompassing the first two weeks after conception. | 23 | |
| 389915834 | Habituation | A gradual reduction in the strength of a response when a stimulus event is presented repeatedly. | 24 | |
| 389915835 | Irreversibility | The inability to envision reversing an action. | 25 | |
| 389915837 | Longitudinal design | A research design in which investigators observe one group of subjects repeatedly over a period of time. | 26 | |
| 389915839 | Maturation | Development that reflects the gradual unfolding of one's genetic blueprint. | 27 | |
| 389915841 | Menarche | The first occurrence of menstruation. | 28 | |
| 389915843 | Midlife crisis | A difficult, turbulent period of doubts and reappraisal of one's life. | 29 | |
| 389915844 | Motor development | The progression of muscular coordination required for physical activities. | 30 | |
| 389915846 | Object permanence | Recognizing that objects continue to exist even when they are no longer visible. | 31 | |
| 389915848 | Placenta | A structure that allows oxygen and nutrients to pass into the fetus from the mother's bloodstream and bodily wastes to pass out to the mother. | 32 | |
| 389915850 | Prenatal period | The period from conception to birth, usually encompassing nine months of pregnancy. | 33 | |
| 389915852 | Primary sex characteristics | The sexual structures necessary for reproduction. | 34 | |
| 389915853 | Proximodistal trend | The center-outward direction of motor development. | 35 | |
| 389915855 | Puberty | The period of early adolescence marked by rapid physical growth and the development of sexual (reproductive) maturity. | 36 | |
| 389915857 | Pubescence | The two-year span preceding puberty during which the changes leading to physical and sexual maturity take place. | 37 | |
| 389915859 | Scaffolding | Situation that occurs in cognitive development when the assistance provided to a child is adjusted as learning progresses. | 38 | |
| 389915861 | Secondary sex characteristics | Physical features that are associated with gender but that are not directly involved in reproduction. | 39 | |
| 389915863 | Separation anxiety | Emotional distress seen in many infants when they are separated from people with whom they have formed an attachment. | 40 | |
| 389915864 | Sex | The biologically based categories of male and female. | 41 | |
| 389915866 | Socialization | The acquisition of the norms, roles, and behaviors expected of people in a particular society. | 42 | |
| 389915868 | Spermarche | The first occurrence of ejaculation. | 43 | |
| 389915870 | Stage | A developmental period during which characteristic patterns of behavior are exhibited and certain capacities become established. | 44 | |
| 389915871 | Temperament | An individual's characteristic mood, activity level, and emotional reactivity. | 45 | |
| 389915873 | Zone of proximal development (ZPD) | The gap between what a learner can accomplish alone and what he or she can achieve with guidance from more skilled partners. | 46 | |
| 389915875 | Zygote | A one-celled organism formed by the union of a sperm and an egg. | 47 |
